The utility model discloses a liquid crystal displaying password keyboard of dynamic compositor, which solves the problem that the existing password keyboard is easy to divulge passwords. The utility model has the advantages of simple structure, high safety and high confidentiality. The utility model has the structure that the liquid crystal displaying password keyboard of dynamic compositor is composed of a display input assembly, a corresponding controlling and processing circuit, etc. The utility model is characterized in that the display input assembly is composed of a liquid crystal key code display device, a corresponding key assignments input device, a correcting key and a clearing key, wherein the liquid crystal key code display device is connected with the controlling and processing circuit through a flexible cable, and the controlling and processing circuit controls the liquid crystal key code display device to randomly display ten number key codes from 0 to 9 as well as the correcting key and the clearing key; the key assignments input device sends key assignments corresponding to selected key codes to the controlling and processing circuit, and the key assignments are transmitted to a supervisory computer after processed.